<!DOCTYPE html>
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Document</title>
    <!-- <style>
        div {
            width: 100px;
            height: 100px;
            /* border: 10px solid purple; */
            border-width: 10px;
            border-style: dashed;
            border-color: aqua;

            padding: 20px;
            margin: 20px;
        }
        div{
            border-bottom-style: dotted;
        } -->
<style>
    div{
        width: 0px;
        height: 0px;
        border: 30px solid transparent;

        /* border-top-color: black; */
        border-bottom-color: brown ;
        /* border-left-color: chocolate; */
        /* border-right-color: darkgreen; */
    }
/*     
    div div{
        width: 15px;
        height: 15px;
        border: 30px solid transparent !important;
    } */
</style>
</head>
<body>
    <!-- <div>kajshdkajsfhkdfjghkdjfhkgdh</div>
    <div>kajsdhadsfdsfksjhd</div> -->

    <div>
    </div>
</body>
</html>